If you see this error, it's likely that there is no session.save_path listed in the php.ini for phpmyadmin.

To fix this:

• Login to your server via SSH
• Type: cd /usr/local/cpanel/3rdparty/etc/phpmyadmin/
• Type: nano php.ini
• Look for the section [Session] and scroll down to see if session.save_path is commented out. If it is, remove the # line and set the save path to /tmp
• Press Ctrl O to save
• Press Ctrl X to exit
• Type: service cpanel restart